Re: outbound call to some specific phone numbers fail

Indicates that an attempt is made to connect to non-ISDN equipment. (For example, an analog line.)

This cause indicates that the equipment sending this cause has received a request to establish a call that has a low layer compatibility, high layer compatibility, or other compatibility attributes (for example, data rate) that cannot be accommodated.

This code is often seen when the calling device dials the wrong number, and ends up reaching a non-ISDN device. Therefore, verify that the number dialed is correct.

It could also be generated when a a data call was made to voice number, or a voice call is made to a number that only supports data. If the dialed number is correct, the telco may have configured their switch incorrectly.

So the question is: the calls to the destination that fails - are they voice calls or data calls?

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